Effect of Oscillatory Shear on the Mechanical Properties and Crystalline Morphology of Linear Low Density Polyethylene

Zhong-bin Xu; Liang-yao Su; Peng-fei Wang; Mao Peng

doi:10.1007/s10118-015-1663-6

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Effect of Oscillatory Shear on the Mechanical Properties and Crystalline Morphology of Linear Low Density Polyethylene

PAPER | Updated：2021-06-21

- Effect of Oscillatory Shear on the Mechanical Properties and Crystalline Morphology of Linear Low Density Polyethylene
- Chinese Journal of Polymer Science Vol. 33, Issue 8, Pages: 1114-1124(2015)
- Affiliations：
  
  a.College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
  b.Department of Polymer Sci & Engn, Zhejiang University, Hangzhou 310027, China
- Author bio：
  
  **Mao Peng (彭懋), E-mail: pengmao@zju.edu.cn
- Funds：
- DOI：10.1007/s10118-015-1663-6
  CLC：
- Received：26 November 2014，
  
  Revised：2015-01-19，
  
  Accepted：08 February 2015，
  
  Published：2015-08
- Accepted：
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Zhong-bin Xu, Liang-yao Su, Peng-fei Wang, et al. Effect of Oscillatory Shear on the Mechanical Properties and Crystalline Morphology of Linear Low Density Polyethylene[J]. Chinese Journal of Polymer Science, 2015, 33(8): 1114-1124.
DOI：

Zhong-bin Xu, Liang-yao Su, Peng-fei Wang, et al. Effect of Oscillatory Shear on the Mechanical Properties and Crystalline Morphology of Linear Low Density Polyethylene[J]. Chinese Journal of Polymer Science, 2015, 33(8): 1114-1124. DOI： 10.1007/s10118-015-1663-6.

摘要

Abstract

In this study

effects of oscillatory shear with different frequencies (0-2.5 Hz) and amplitudes (0-20 mm) on the mechanical properties and crystalline morphology of linear low density polyethylene (LLDPE) were investigated. It was found that the mechanical properties of LLDPE are improved because of the more perfect crystalline structure when LLDPE crystallizes under low-frequency and small-amplitude (0.2 Hz/4 mm) oscillatory shear. The mechanical properties can be further improved by increasing either the frequency or the amplitude of oscillatory shear. The Young’s modulus and tensile strength of LLDPE are improved by 27% and 20%

respectively

when the frequency is increased to 2.5 Hz and the amplitude is maintained at 4 mm; while the Young’s modulus and tensile strength are improved by 49% and 47%

respectively

when the amplitude is increased to 20 mm and the frequency is remained as 0.2 Hz. The crystallinity and microstructure of LLDPE under different oscillatory shear conditions were investigated by using differential scanning calorimetry

wide angle X-ray diffraction and scanning electron microscopy to shed light on the mechanism for the improvement of mechanical properties.

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